I too use a home made adapter (from the navcoder zip file) it works perfectly and I've had no problems with it.

I made mine with a DB9 and the OEM cd changer plug, so no messing about, plug and play.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.